The correct order of boiling point for primary $({1^o}),$ secondary $({2^o}),$ and tertiary $({3^o})$ alcohols is

• A
  ${1^o} > {2^o} > {3^o}$
• B
  ${3^o} > {2^o} > {1^o}$
• C
  ${2^o} > {1^o} > {3^o}$
• D
  ${2^o} > {3^o} > {1^o}$